Photonic quantum information processing is a type of information processing based on the principles of quantum optics. Continuous-variable (CV) quantum information of photons underpins a variety of quantum sensing and communication applications. Various of these quantum applications involve the generation and distribution of the two-mode squeezed vacuum (TMSV) state photons. My research topics cover these important subjects and can be divided into three parts. First, I theoretically proposed an integrated photonic platform for the generation of TMSV photons and experimentally fabricated the structure on the chip to successfully carry out these TMSV photons on the chip. This part is compatible with complementary-metal-oxide-semiconductor (CMOS) technology and paves the road of mass production of quantum integrated photonic platforms. Second, I theoretically proposed a CV quantum repeater architecture with the assistance of quantum error correction (QEC) and optical Gottesman-Kitaev-Perskill (GKP) state to realize long-haul entanglement establishment with high fidelity. To prove its usefulness, I applied these protocols on two representative use cases for quantum communication and sensing. Once optical GKP states with sufficient squeezing become available, the proposed QR architecture will enable CV quantum states to be faithfully transmitted over unprecedented distances, thereby making a large stride forward in the development of quantum technology. Finally, I theoretically proposed a quantum-radar scheme by transmitting the pulse-compression microwave field for investigating the direction of a distant object with higher sensitivity than the classical counterpart. This work generalizes the previous results in quantum radar ranging in [Phys. Rev. Lett. 128, 010501 (2022)] towards a general quantum radar detection system capable of detecting various properties of targets.

Bo-Han Wu is currently a Physics PhD candidate at the University of Arizona in the US and received his MS degree in National Tsing Hua University and BS degree in National Chiao Tung University in Taiwan. He has a broad interest in quantum information science that covers both theory and experiment. During his PhD experiment study, he designed, fabricated and tested the photonic chip to generate the on-chip continuous-variable (CV) entangled photon; In his PhD theory study, he proposed a protocol of CV quantum repeater to distribute long-distance entanglement and a quantum radar scheme to interrogate the direction of an distant unknown object with experimentally feasible parameters. During his MS study, he was experienced in theoretical modeling of electromagnetically induced transparency (EIT) based quantum memory in cold atomic system.